Optical apparatus for gauging



April 17, 1945. "E. WURGE R v OPTICAL APPARATUS FOR GAUGING Filed April 29, 1942 a fine hair-line, and an objective.

Patented Apr. 17, 1945 UNITED STATES PATENT OFFICE OPTICAL APPAZSZZTIQIZQFOB GAUGING Emile Wurger, Le Locle, Switzerland Application April 29, 1942, Serial No. 441,023 In Switzerland January 15, 1941 1 Claim.

The present invention relates to an optical apparatus for gauging, comprising a projector and indicating screen. According to the invention a set of levers of which each actuates a reflector redirects a ray it receives from the projector on the said screen, the levers each co-operating at one end with a push rod designed to contact with a particular point or region on the workpiece when the latter is in position, and at the other end with one or the other of a pair of electric contacts when the dimension of the corresponding point or region on the workpiece is outside the permitted tolerance one way or the other, an electric signalling device in whose circuit the contacts are included then being brought into action.

The accompanying drawing illustrates by way of example one form of embodiment of the invention.

Figure 1 is a vertical section of the optical auging apparatus,

Figure 2 is a plan view of a part of the apparatus,

Figures 3 and 4 show details of the apparatus.

The apparatus shown comprises a base I2 on which are mounted three sets of pillars 5, ii and 6. The pillars 5 support a spindle It on .which pivot six levers I (Figure 2) which through links '1 transmit oscillations imparted to them, each to a reflector 8 having a silvered surface 8.

On the pillar 5" is supported a projector 2 which comprises in known manner, a reflector, a lamp, a condenser, a transparency marked with Images of the line are thus projected by the re-direction of v the reflector 8 on to a reading screen I secured inside the casing l of the apparatus. This screen is shown in Figure 3 wherein it will be seen that a scale with and graduations is provided for each of the six levers I.

At the ends 0! the levers are contacts 8 and ill. They are adjustable on' their supports to agree with the limits of tolerance admissible for the corresponding dimensions of the workpiece. The contacts l0 when touched by the levers 'I complete an electric supply circuit through conductors I0 and red lamps Ill carried in a signal lamp H, which indicates that the tolerance has been exceeded in a direction not admitting of rectification 'oi' theworkpiece. The contacts 9 operate in a similar manner, being connected,

The lamps 9 and Ill are covered by an indicator disc H (Figure 4) provided at its centre with a diagram of the workpiece 4, on which are indicated by the circled references (D to (9; the six particular points or regions at which the push rods 1 co-operating with the ends I of the levers I, make contact'with the workpiece 4"- when the latter is in position on a gauging member 4 which takes it bearing on a support 3 and in which slide the push rods 1. The disc is is also provided over its peripheral margin with a series of figures 1 to 6 and a series of figures 1 to 6, corresponding in position to the respective red and blue lamps 9 and ill.

If when the workpiece is in position the ends of the levers 1 are between the contacts 9 and I0,

' however,-by 'contactors' a .to blue'lamps'l -indieating that the tolerance has been exceeded in no signal is given; this indicates that the workpiece is correct and all the gauged dimensions are within the permitted tolerances, the actual variations from the nominal dimensions bein indicated on screen I. If, however, for example, the red lamp corresponding to Figure 5 of the series lights up, it i immediately apparent that the dimension of the workpiece is beyond the limit at the point or region 5. The apparatus accordingly enables it to be seen at a glance whether the dimensions of a workpiece are within the +ve and ---12e limits oi tolerance, and it not the apparatus also indicates at which point the piece is in error and in which direction. Thus the apparatus enables the pieces to be sorted into those which are correct, those which need to be rectified and those which must be scrapped.

What I claim is:

An optical gauging device comprising a projector, an indicating screen, a set of levers, a

set of corresponding reflectors each actuated by one of said levers and re-directing a ray from said projector on to said screen, a corresponding set of push rods each adapted to make contact with a respective region oi. a workpiece to be gauged when the workpiece is placed in position in the device, a corresponding set of pairs of electric contacts juxtaposed to the other ends of piece reaches one limit of tolerance and the y other contact located to be touched by the lever end when the corresponding dimension of the workpiece reaches the other limit of tolerance,

andrespective electric signals whose circuits are closed by the contacts.

EMILE WIJRGER. 

